Which of Newton's laws best explabckg 1:1 ptf.4mcxixx,k.,o luw1: hpins why motorists should buckle-up?

  When you sit on a chair, the resultant force30fd0htsl b j4sf6e/ 5r5dlsj on you is

  In the absence of an external forc; dlql g(/rtv1e, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tur1kfamlk p 15y2ned off, while traveling in empty space1pk l2yfm51a k, the starship will

  A rocket moves through empty space in a straight line with coi8jwba- 9tbiggd (10enstant speed. It is far from the gravitational effect of any star or planet. Ubbtie- jagi w0d918g(nder these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwfynwaf * y4g;.ard, and you suddenly fall forward. You can imply n *.f;4wa gyfyfrom this that the bus's

  You are standing in a moving bus, facing forward, and you suddenly fall fsytxf)ujc-y: al7s.spy) ,s1 orward as the bus comes to 1a s )-,yt fc7sl) usys.y:xpjan immediate stop. What force caused you to fall forward?

  A constant net force acts on an objec mq).x/o6 gejft. Describe the motion of the object.

  The acceleration of an object is inversel df/e5ms,:4i m( dudg,o;xe axh on0/uy proportional to

  A net force F accelerates a mass m with an acceleration a. If the same netb;20ypok- z fv force is applied to maky fp0z;o b2v-ss 2m, then the acceleration will be

  A net force F acts on a mass m andezf.is/mh8q ( 5m-vv )wz 5oyyg1ja5w produces an acceleration a. What acceleration results if a net force 2F a)ji8om.w-5vywhsza /z1(y55 egm vf qcts on mass 4m?

  If you blow up a balloon, asom i dx9vxxvl2.;dgc6nf 01 +nd then release it, the balloon will fly away. This is an illustratiof;lo vnsx i 60 +x2cv1dmxg9d.n of

  Two cars collide head-on. At every moment during the 8pl 2zfyl72 ozcollision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitplfy27zz 8l 2oude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an object, the force wh6 rjc n0japc6 ;ryz(/sich the object exerts on you wi66y0cap rcr(znsjj /; ll

  Action-reaction forcn qouif6 6k3l*es

  Action-reaction forces xxdxbf*,rh 3d9 hj2ip/g7ia 0are

  A 20-ton truck collides with a 1500-lb car and af v:ar ab2 (vfy0(fs/:50:lnwe rylmcauses a lot of damage to the car. Since a lot of damage is done on the crleffyws(5a2rvl :n yf v: a0:m/b (a0ar

  An object of mass m sits on a flat table. The Earth pulls on this object witz(hszj54gn k er4s1 gf5 f;-chh force mg, which we will call the actigz55k-1( zh4hsn4fjsfr ce g;on force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. Th5hbm i qain/ 4;;ag 9/s1xcviae Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "ria4b51/ia h viq mngs c9x/a;;eaction force"?

  Your bat hits the ball pitched to you with a 1500-N iobuxuypvgoo:1c,1q /87bp. instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude ioc8:u p/,ypg7b o.vboqx1i 1us

State Newton's three ls ts,2dw5v; -11cgp dbytb8hwaws.

  Mass and weight

  The acceleration due t:fov ra z/loc91xrx. /o gravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compar:1.l9 ox/zcvaxr/o fr ed to Earth?

  An example of a force which acts at a disyn)p y lrl.5;jtance is

  Who has a greater weight to mass ratio, a person weighing 400 N or a person weim2 1w(-umitcfghing 600 Nfi1mm-t wu (2c?

  A stone is thrown stc h:(6ir u01 tc2dmfmqraight up. At the top of its path, the net force acting on it frhdc(t m1iq:m60 c2uis

  A 20-N weight and a 5.05 wymowv49 cd4 sy+(m2qbg a;t-N weight are dropped simultaneously from the same height. Ignore air resibtv 5aq9 w4+4myc2wsyo( m d;gstance. Compare their accelerations.

  A brick and a feather fall to the earth at theq6xz 09 n 2n*qj*lgyzeir respective terminal velocities. Which object experiences9e gqnn y*j6x0 l*zzq2 the greater force of air friction?

  An object of mass m is hanging by a string e*x*1zv( kh2s8zenk8,se uznp7 ut4qfrom the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the sqk 7*vxnuuz ez4z p2keh,n(8st18es* tring?

  An object of mass m is hanging by a string from the ceilidmy; ;+i;sxl e( dc9odng of an elevator. The elevator is moving upward, but slowing down. What is the tension in the stx;9 + e sli;;dd(mycodring?

  The force that keeps you from sliding on an -e;ua8)jclb ildk.m , icy sidewalk is

  It's more difficult to start moving a heavy carton fro1ihchc1 h1pw (m rest than it is to keep pushing it with h1(1icp c1hwhconstant velocity, because

  A horizontal force accelerates a box from rest across a,3 (3w6*t mjof4eoq nq d:arrn horizontal surface (friction is present) at a constant rate. The exer,n q mown6 a3do(4jq*r3:ftperiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramoiiw:t xu09 mlb(ud i-08to9 ip at constant velocity. Thus we can deduce(d 0ib9wlo8 tiu mx9uti0 -:io that

  A block of mass M slides down a frictionless pnov 0bk z7mp0(lane inclined at an angle q with the horizontal. The normal reaction force exerted op 0vbnm70 z(kby the plane on the block is

  A block of mass M sli5fdl ev yvpcr,df2f-b+r .3 +mmlr1x*des down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the blr*f.bmr+lf 5e- fy +dvmlr2pxv ,c1d3ock is directed

  A block of mass M slides down a frictionless plane 6;3imseb :od/mioy o/tcdky9k;7,r i inclined at an angle q with the horizo3 ob/ tyo:kersci;ikoiy / ,m7d9m;d 6ntal. The gravitational force is directed

  Two toy cars (16 kg and 2.0 kg) are released simultane;9h;pzrbskc gb -4-nw+ n9hxsously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement wh-r h-9+hzwxcpbn g9bs s;kn ;4ich best describes their acceleration after being released.

  An object sits on a frictionl . f at0tcx(r tana:3uuv:km,1ess surface. A 16-N force is applied to the object, and it accelervat (unxuca.f 1:ka3 mt,tr:0ates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to 27 m/m. semm/ zob;e3xdl6+s in 7.0 s. What is the average forward force on thz;mbxs3 +eld6 ./ oemme car?

  Starting from rest, a 4.0-oqdg*(h 6;s eykg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body 6q*sog(;hyd e?

  An antitank weapon fires a 3.00-kg rocket wh2sw73 2mmn+hz te y+:l ufzla.ich acquires a speed of 50.0 m/s after traveyz7+aw2znh llt2+sm3:eu m f .ling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

  If you push a 4.0-kg mass with the same force that y: 9 d :b2i+vgunbdlp61t0 vg hn-v-lsjou push a 10-kg mass from restultvjn g-d- : svb9pb0 nivg2hl6+:d1,

  What is the mass of a person who weighs 110 lb? flg /wo54h r+go r6.zz;8utab

  What is the mass of an object that weighs 250 N on t. 1 +rm2bgy*r )h7m*ktngk5j1w yqr3gpx d 7ouhe surface of the Earth where the acceleration due to graygpq nod7 3y7* r5jmb*. )umg1r1+hrtkkxg2 wvity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object o qgslltn-t3ceoegmo w5 9e0h; 9v 249on the surface of the Moon where the acceleration due to gravity is o;eq9glno5emwtot09o 42h3c g e- l9vsnly 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 (uw+e+oqbovk3q af7 vj/2 tb)N on the Moon. The Moon's gravity is one sixth of Earth's. Comuv2oboa++)3qj vtfek/qb 7w (pare the masses of the objects.

  Sue and Sean are having a tug72rae1 zc5 qmchkht c6r1* y kw7f.n(mk6m(p w-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward Sue a215 k6wn.f y 1kerpwhrz*a6 (qhc (k cctmmm77t $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A forc3k 5 1naen:bz6l eg,bee F acts on the stack, and it accele, :a5b 61ek3nlezgn ebrates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

  A person of weight 480 N stands on a scale in an elevator. b h (kz3see5(b/ri)qp What will the scale be reading when the elevator is accelerating dow)sp bzr3 (e/ 5h(ieqkbnward at $4.00 \; m/s^2$?

  A person on a scale rides in an elq iac zq bep)0.95 dytdz8ebpo-i +.k y;68zslevator. If the mass of the person is 60.0 kg and td8 -zkabs8+q cot) e iy.izdey69b.pqpz l 5;0he elevator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If t:cs finym54otw 6k0n h(fs,h-7 ksi6khe mass of the person is 60.0 kg and the elevator accelerates upward wit6t ckw0m6iknkh57n sf -s:(hs4 of,iyh an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force has a magnitudmyd( i wl c:cnkf/y;(-e of 8.0 N and is directed due north. The second force;f(( kydm li/n:y cw-c toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on the flatbed of a truck. It is hel;yawqmu:pjli )e(k :,d in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping dymuwkaij: (q)e l:p, ;istance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbedjatmz-s. c :(j of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum sz-jj: t.s(c amtopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = n* brqdb80y qm :-;fgs0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and yqdgq*r8fs :bbn0-m;the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, i-)+yneyr ly81w(co jf f M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore frictio-8y)yjfr y 1wle(c+n on and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor p7qgn1 +(a wyqwith a force of 100 N iy+g7qnwa q p(1n a direction of $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

  A student pulls a box of books oo h szjs2v-v+-n a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is the normal force on the box?s hv2-ovjzs-+

  A traffic light of weight 100 N is supported by two ropes as shown in .wt qgs.,4d6b whc+js Fig. 4-2. What are the ten+ghs wwq .tb6j.,sd4 csions in the ropes?

  In Fig. 4-2, if the tewy6ha ucs q(twdn*4ok7*akbl2gi*38 nsions in the ropes are 50 N, what is the mass of the traftyn4d ok a86ls*uq(bi* c*w3kgh27 wafic light?

  Two boxes of masses m and 2m are in contact with each)(5w:geu o ;fpu 82vcp1 vm-hdu ig:nr other on a frictionless surface. (See Fig. 4-3.) -w5v1rp ci :nou:)d(fu8upg2hm ev;g What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each ot ;6 m r(hv45r68jyaaxa8rf mgjher on a frictionless surface. (See Fig. 4-3.) What is the net force o8 rjg6xm f5jry(8 m;ar4a6vha n the more massive box?

  Two boxes of masses m and 2m are connected b 3 cu:k7)yfinpy a rope. (See Fig. 4-4.) If the forward forceyf3pn:uc)i7 k on the more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected bae4 -,+;c5vr z3rygx.ngpkmq y a rope. (See Fig. 4-4.) If the forward force on the more massive boy.gkr x-;3ac n 4mqprg5+,ve zx is F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over -(qc ,hxha.lwf27p*d zcgx/uu lj86ea pulley as shown in Fig. 4-5. Box I of mu c.h7cxe(wfq8jh ,x2az*l du-/pgl 6ass
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

  The coefficient of static and kinetic frict;(yoo/krg + lpzuu95+. p cqjlions between a 3.0-kg box and a desk are 0.40 and 0.3+p/c9u r l+jqoz;(u .kplo g5y0, respectively. What is the net force on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetix4 m29adlwu h +y0dlild k1(;rc frictions for plastic on wood are 0.50 and+4xl(k; 0 lhwyiddd29 l1u amr 0.40,
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

  An object slides on a level surfa -zn l m1(t4cc+ 0y+m vqgqkjzq1.j-rwce in the +x direction. It slows and comes to a stmqz+mzgkq4tl --q.n vj11y(cr0c wj+ op with a constant acceleration of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a vp7fh24f jr g:dgbj8+ horizontal surface is pulled by a 5.0-N force. A 3.0-N frict j 7vg+48dhf bgpfr2j:ion force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-kg mass, j3yfyw,o,oz2 from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed of 10 m/s. It slidesiaz29o5fe7l4 *h wd5 :h w:g 7nb2qvwh* rsqng 50 m on the ice before it stops. What is tdqrgvwzn i n:f7l*wg5 h2:hbw*sq92 7h ea5o4he coefficient of kinetic friction between the puck and the ice?

  During the investigation of a traffic accident, police find skidlz9nb15rvpfsm ),g q 0 marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the 1rqm9)lb 0n sp,fv5g zprevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweenai2ys:5 hgykt 3sr6- i the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more massive box, what is the static friction force ytsi62gh -3irsya 5: kon the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface betweenh,q ol .ud8dty:d3 :lqrsl+.f the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does nofousll:yrl.h q, 38q +: .tdddt slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictio4eb x3/ li 5jt 6btd,pztv:w0dnless inclined plane. The plane is inclined at an angle ofzwjd:p504 tixd 6t/etvb3l b, $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides d61f3/d * 7ymcvulu(a2hxdaeu (z nl3kown a flat hill that makes an angle of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth incs2rnlj;m3 u6tvh / 7rflined plane with an angle of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

A block lies on a smooth inclin+m8r iv:x9 *otziu;dym6vpo 4ed plane tilted at an angle of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?

  A wooden block slides directly down an in 9rx-fwtuhwr/. . vevll+3b4tclined plane, at a constant velocity of 6.hu.v /w- f.wbr xl3l+rt9e4 tv0 m/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass m slides down a roug1a d,m3: dgyheh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m t,gbnz-ofnj o77;x) x slides down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

  A bulldozer drags a log weighing 500 N along a rough surface. The t3se lkq y7t10cable attached tke1t3ys7 t q0lo the log makes an angle of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

A 25.0-kg box is releasy1 y qvq rd(o bf:lhs*/y/6l*xed from rest on a rough inclined plane tilted at an angle o ls o r(:*hlxyy*6 bdfqqy1//vf $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.

  An object is placed on an inclined plane. The aq-s: ni*p)dahngle of incline is gradually increased until the object begins to slide. The angle at which thpqni:d sa*-) his occurs is q. What is the coefficient of static friction between the object and the plane?